Compilare: user.cpp: In function ‘void myfill()’: user.cpp:26:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(viz[l][c]==0) ^ user.cpp: In function ‘int main()’: user.cpp:38:21: warning: unused variable ‘k’ [-Wunused-variable] int n, m, i, j, k; ^ user.cpp:40:72: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d%d%d", &n, &m, &A.lin, &A.col, &B.lin, &B.col); ^ user.cpp:43:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &mat[i][j]); ^