Compilare: main.cpp: In function 'int main()': main.cpp:44:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < v.size() ; i++) ~~^~~~~~~~~~ main.cpp:47:28: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<long long int>::size_type {aka long unsigned int}' [-Wformat=] printf("%d ",sol.size()); ^ main.cpp:48:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < sol.size() ; i++) ~~^~~~~~~~~~~~ main.cpp:53:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1 ; i < v.size(); i++) ~~^~~~~~~~~~ main.cpp:29:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("triunghi2.in","r",stdin); ^ main.cpp:30:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("triunghi2.out","w",stdout); ^ main.cpp:32:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld",&n); ^ main.cpp:35:66: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld%lld%lld%lld%lld",&x1,&y1,&x2,&y2,&x3,&y3); ^ main.cpp:41:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld",&x,&y); ^