Compilare: main.cpp: In function 'int main()': main.cpp:53:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<Sol.size(); ++i) { ~^~~~~~~~~~~ main.cpp:62:30: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<std::pair<int, int> >::size_type {aka long unsigned int}' [-Wformat=] printf("%d\n", Out.size()); ^ main.cpp:63:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<Out.size(); ++i) printf("%d %d\n", Out[i].first, Out[i].second); ~^~~~~~~~~~~ main.cpp:13:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cuplaj.in", "r", stdin); ^ main.cpp:14:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cuplaj.out", "w", stdout); ^ main.cpp:15:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &N, &M, &E); ^ main.cpp:20:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^