Compilare: user.cpp: In function ‘int main()’: user.cpp:64:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < vx.size(); ++ i) { ^ user.cpp:65:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j < vy.size(); ++ j) { ^ user.cpp:75:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < vx.size(); ++ i) { ^ user.cpp:76:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j < vy.size(); ++ j) { ^ user.cpp:34:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("colaj.in", "r", stdin); ^ user.cpp:35:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("colaj.out", "w", stdout); ^ user.cpp:37:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:39:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &m, &p); ^ user.cpp:43:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ user.cpp:49:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^