Compilare: user.cpp: In function ‘int main()’: user.cpp:33:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( i = 0; i < sol.size(); ++i ) { ^ user.cpp:21:18: warning: unused variable ‘j’ [-Wunused-variable] int n, m, i, j, x, y, c; ^ user.cpp: In function ‘void APM(int, int)’: user.cpp:60:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, x, y, rx, ry; ^ user.cpp:60:15: warning: unused variable ‘x’ [-Wunused-variable] int i, j, x, y, rx, ry; ^ user.cpp:60:18: warning: unused variable ‘y’ [-Wunused-variable] int i, j, x, y, rx, ry; ^ user.cpp: In function ‘int main()’: user.cpp:18:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "apm.in", "r", stdin ); ^ user.cpp:19:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen( "apm.out", "w", stdout ); ^ user.cpp:23:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d",&n,&m ); ^ user.cpp:25:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d%d%d",&x,&y,&c ); ^