solved 5-2 *plenty* fast

5_2/Makefile

@@ -0,0 +1,13 @@
+client: main.c
+	gcc -o main main.c -O3 -Wall -Wextra -g -march=x86-64-v3
+
+client-debug: main.c
+	gcc -o main main.c -O1 -Wall -Wextra -g -fsanitize=address
+
+client-debug-nosanitize: main.c
+	gcc -o main main.c -O1 -Wall -Wextra -g
+
+clean:
+	rm main
+
+.PHONY: clean

5_2/main.c

@@ -0,0 +1,216 @@
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <string.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <time.h>
+#include <limits.h>
+
+char input[] =
+{
+#embed "input.txt"
+,'\0' // null terminator
+};
+
+int width = 0;
+int height = 0;
+uint64_t result = 0;
+
+
+uint64_t parseNum(char* str, int* len){
+    int i = 0;
+    uint64_t out = 0;
+    while(str[i] != ',' && str[i] != '-' && str[i] != '\n'){
+        out += str[i]-0x30;
+        out *= 10;
+        i++;
+    }
+    out /=10;
+    *len = i;
+    return out;
+}
+
+int numPlaces (uint64_t n) {
+    int r = 1;
+    while (n > 9) {
+        n /= 10;
+        r++;
+    }
+    //printf("%d has %d places\n", n, r);
+    return r;
+}
+
+uint64_t power(uint64_t base, uint64_t exp) {
+    uint64_t i, result = 1;
+    for (i = 0; i < exp; i++)
+        result *= base;
+    return result;
+}
+
+void sort_ranges(uint64_t* starts, uint64_t* ends, int len){
+    
+    for(int i = 0; i<len-1; i++){
+        int curr_min = i;
+        for(int o = i+1; o<len; o++){
+            if(starts[curr_min]>starts[o]){
+                //printf("%lu is bigger than %lu, so we have a new lowest\n", starts[curr_min], starts[o]);
+                curr_min = o;
+            }
+        }
+        uint64_t tmp_start = starts[curr_min];
+        uint64_t tmp_end = ends[curr_min];
+        
+        starts[curr_min] = starts[i];
+        ends[curr_min] = ends[i];
+
+        starts[i] = tmp_start;
+        ends[i] = tmp_end;
+    }
+}
+
+//bool check_fresh(uint64_t storage, uint64_t* starts, uint64_t* ends, int length){
+//    int guess = length/2;
+//    int diff = length/4;
+//    while(true){
+//        printf("guess is %d", guess);
+//        diff = (diff/2)+1;
+//        if(storage>starts[guess] && storage<starts[guess+1]){
+//            break;
+//        }else if(storage>starts[guess]){
+//            guess += diff;
+//        }else{
+//            guess -= diff;
+//        }
+//    }
+//    if(storage<ends[guess]){
+//        return true;
+//    }else{
+//        return false;
+//    }
+//}
+
+bool check_fresh(uint64_t storage, uint64_t* starts, uint64_t* ends, int length){
+    //printf("checking %lu", storage);
+    
+    for(int i = 0; i<length; i++){
+        if(storage>=starts[i] && storage<=ends[i]){
+            //printf(" .....fresh \t(is in range %lu - %lu)\n", starts[i], ends[i]);
+            return true;
+        }
+    }
+
+    //printf(" .....spoiled\n");
+    return false;
+}
+
+void join_ranges(uint64_t* starts, uint64_t* ends, int* range_count){
+    int new_count = 0;
+    for(int i = 0; i<*range_count; i++){
+        int n=0;
+        uint64_t end = ends[i];
+        while(starts[i+n+1]<=end+1){
+            n++;
+            if(end<ends[i+n]){
+                end = ends[i+n];
+            }
+        }
+        starts[new_count]=starts[i];
+        ends[new_count]=end;
+        new_count++;
+        i+=n;
+    }
+    starts[new_count+1] = ULLONG_MAX;
+    *range_count = new_count;
+}
+
+int main(int argc, char *argv[]){
+    clock_t start, end;
+    start = clock();
+
+
+    //parse ranges first
+    int i = 0;
+    int range_count = 0;
+    while(input[i] != '\n'){
+        while(input[i] != '\n'){
+            i++;
+        }
+        range_count++;
+        i++;
+    }
+    //printf("range count: %d\n", range_count);
+
+    //i++;
+    //int storage_count = 0;
+    //while(input[i] != 0){
+    //    while(input[i] != '\n'){
+    //        i++;
+    //    }
+    //    storage_count++;
+    //    i++;
+    //}
+    //printf("Storage count: %d\n", storage_count);
+
+    uint64_t starts [range_count+1];
+    uint64_t ends   [range_count+1];
+
+    i = 0;
+    int range_num = 0;
+    int len = 0;
+    while(input[i] != '\n'){
+        starts[range_num] = parseNum(&input[i], &len);
+        i+=len+1;
+        ends[range_num] = parseNum(&input[i], &len);
+        i+=len+1;
+
+        //printf("%d-%d\n", starts[range_num], ends[range_num]);
+        range_num++;
+    }
+
+    //for(int i = 0; i<range_count; i++){
+    //    printf("%lu-%lu\n", starts[i], ends[i]);
+    //}
+
+    //range_num = 0;
+    //uint64_t* storage = malloc(sizeof(uint64_t)*(storage_count));
+    //i++;
+    //while(input[i] != 0){
+    //    storage[range_num] = parseNum(&input[i], &len);
+    //    i+=len+1;
+    //    
+
+    //    //printf("%d-%d\n", starts[range_num], ends[range_num]);
+    //    range_num++;
+    //}
+
+    //printf("\n");
+    //for(int i = 0; i<storage_count; i++){
+    //    printf("%lu\n", storage[i]);
+    //}
+
+    sort_ranges(starts, ends, range_count);
+
+    join_ranges(starts, ends, &range_count);
+
+    //for(int i = 0; i<range_count; i++){
+    //    printf("%lu-%lu\n", starts[i], ends[i]);
+    //}
+
+
+    for(int i = 0; i<range_count; i++){
+        result += ends[i]+1-starts[i];
+    }
+
+
+    end = clock();
+    printf("count: %lu\n", result);
+    clock_t ticks_taken = end - start; 
+    double time_taken = ((double)ticks_taken)/CLOCKS_PER_SEC;
+    printf("time take: %f ticks\n", time_taken);
+    printf("CLOCKS_PER_SEC: %ld\n", CLOCKS_PER_SEC);
+
+
+    exit(1);
+}