Compilare: main.cpp: In function 'int solve(int)': main.cpp:102:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<qr[i].size();j++) ~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:117:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("lampa2.in","r",stdin); ^ main.cpp:118:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("lampa2.out","w",stdout); ^ main.cpp:120:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&n,&xl,&yl,&D); ^ main.cpp:123:47: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&v[i].first,&v[i].second); ^