Compilare: user.cpp: In function ‘int main()’: user.cpp:98:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cri.in", "r", stdin); ^ user.cpp:99:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cri.out", "w", stdout); ^ user.cpp:100:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d", &n, &m, &x, &y); ^ user.cpp:102:58: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int j = 1; j <= m; ++j) scanf("%d", &a[i][j]); ^ user.cpp: In function ‘int suma1(int&)’: user.cpp:22:32: warning: ‘nrc’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(nrl % 2 == 0 && nrc % 2 == 0) ^ user.cpp: In function ‘int suma2(int&)’: user.cpp:44:32: warning: ‘nrc’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(nrl % 2 == 0 && nrc % 2 == 0) ^ user.cpp: In function ‘int suma3(int&)’: user.cpp:66:32: warning: ‘nrc’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(nrl % 2 == 0 && nrc % 2 == 0) ^ user.cpp: In function ‘int suma4(int&)’: user.cpp:88:32: warning: ‘nrc’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(nrl % 2 == 0 && nrc % 2 == 0) ^ user.cpp: In function ‘int main()’: user.cpp:105:25: warning: ‘k’ may be used uninitialized in this function [-Wmaybe-uninitialized] int z, s, sMax = 0, k, nr; ^