Compilare: main.cpp: In function 'int main()': main.cpp:33:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(col[coll].size()==cntcol[coll]) ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~ main.cpp:42:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(lin[linn].size()==cntlin[linn]) ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~ main.cpp:52:32: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<Points>::size_type {aka long unsigned int}' [-Wformat=] printf("%d\n", sol.size()/2); ^ main.cpp:53:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<sol.size(); i+=2) ~^~~~~~~~~~~ main.cpp:56:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1; i<=sol.size(); i+=2) ~^~~~~~~~~~~~ main.cpp:14:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] { freopen("zaharel.in", "r",stdin); ^ main.cpp:15:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("zaharel.out", "w",stdout); ^ main.cpp:18:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:20:37: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d %c", &x, &y, &c); ^