Compilare: user.cpp: In function ‘int main()’: user.cpp:31:52: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(d[i][j] != d1[i][j] || d1[x][y] && !d2[x][y] || !d1[x][y] && d2[x][y]) ok = 1; ^ user.cpp:31:78: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(d[i][j] != d1[i][j] || d1[x][y] && !d2[x][y] || !d1[x][y] && d2[x][y]) ok = 1; ^ user.cpp:10:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(F, "%d ", &t); ^ user.cpp:13:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(F, "%d%d ", &n, &m); ^ user.cpp:14:91: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i = 0; i < m; ++ i) fscanf(F, "%d%d ", &x, &y), d2[x][y] = 1, d2[y][x] = 1; ^ user.cpp:19:43: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(F, "%d ", &d[i][j]); ^