Compilare: main.cpp: In function 'int main()': main.cpp:168:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1; i<=lin.size(); i++) ~^~~~~~~~~~~~ main.cpp:171:9: warning: unused variable 'mm' [-Wunused-variable] int mm=col.size(); ^~ main.cpp:123:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] { freopen("cabana2.in", "r", stdin); ^ main.cpp:124:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cabana2.out", "w",stdout); ^ main.cpp:127:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:129:40: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &v[i].x, &v[i].y); ^