Compilare: main.cpp: In function 'std::pair<int, int> comp(std::pair<int, int>, std::pair<int, int>)': main.cpp:7:4: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if (a.first==b.first) ^ main.cpp: In function 'int calc2()': main.cpp:31:15: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ main.cpp:35:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^ main.cpp: In function 'int main()': main.cpp:48:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("flooow.in","r",stdin); ^ main.cpp:49:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("flooow.out","w",stdout); ^ main.cpp:51:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^