Compilare: user.cpp: In function ‘int main()’: user.cpp:51:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( i = 0; i < v[ x ].size(); ++i ) ^ user.cpp:61:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( i = 0; i < v[ k ].size(); ++i ){ ^ user.cpp:36:18: warning: unused variable ‘j’ [-Wunused-variable] int n, m, i, j, s, t, k, d, x, xx, yy, ma; ^ user.cpp:36:21: warning: unused variable ‘s’ [-Wunused-variable] int n, m, i, j, s, t, k, d, x, xx, yy, ma; ^ user.cpp:36:24: warning: unused variable ‘t’ [-Wunused-variable] int n, m, i, j, s, t, k, d, x, xx, yy, ma; ^ user.cpp:36:30: warning: unused variable ‘d’ [-Wunused-variable] int n, m, i, j, s, t, k, d, x, xx, yy, ma; ^ user.cpp:33:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("markon.in","r",stdin); ^ user.cpp:34:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("markon.out","w",stdout); ^ user.cpp:38:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&x); ^ user.cpp:39:52: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for( i = 1; i <= n; ++i ) scanf("%d",&val[ i ]); ^ user.cpp:42:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&xx,&yy); ^