Compilare: user.cpp: In function ‘int main()’: user.cpp:81:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[n][i] > vmax) ^ user.cpp:86:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[n][i] == vmax) ^ user.cpp:101:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[n][i] == vmax) ^ user.cpp:105:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[1][n-(i-1)+1] >= st) ^ user.cpp:114:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (a[n][i] == vmax) ^ user.cpp:54:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d%d%d%d",&v,&n,&st,&dr); ^ user.cpp:56:28: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&a[1][1]); ^ user.cpp:62:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&x); ^