Compilare: main.cpp: In function 'int main()': main.cpp:84:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(idx < v.size() && v[idx].first == i) { ~~~~^~~~~~~~~~ main.cpp:67:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("lupu.in","r",stdin); ^ main.cpp:68:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("lupu.out","w",stdout); ^ main.cpp:69:31: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&n,&x,&l); ^ main.cpp:73:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&a,&b); ^