Compilare: main.cpp: In function 'int main()': main.cpp:51:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(mat[i][j]>G) G=mat[i][j]; ~~~~~~~~~^~ main.cpp:32:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("origami.in","r",stdin); ^ main.cpp:33:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("origami.out","w",stdout); ^ main.cpp:36:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ main.cpp:43:29: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&op,&x); ^